Wheel mounting



Nov. 2, 1943. K. BREN KERT Re. 22,388

WHEEL MOUNT ING Original Filed Feb. 15, 1941 INVENTOR.

BY /6-/ 4 7 FA'PW/ I Reissued Nov. 2, 1943 WHEEL MOUNTING Karl Brenkert, Detroit, Mich., assignor to Brenkert Light Projection Company, Detroit, Mich., I a corporation of Michigan Original No. 2,269,429, dated January 13, 1942,

Serial No. 379,088, February 15, 1941.

Application for reissue December 7, 1942, Serial No.

11 Claims.

This application is a continuation in part of my co -pending application, Serial No. 312,463, filed January 5, 1940. The invention pertains to a novel mounting of the sprocket wheel and well as the replacement does not require a skilled mechanic.

In the accomplishment of these objects, the invention involves a retaining plate secured to the flywheel of a motion picture hi particufree end of the shaft and in turn secured to the larly in the intermittent mechanism of a proeel. If a headed screw is used to faste th jester, plate to the shaft, the screw head is sufficient It is recognized in the art that the sprocket to clamp the plate into driving engagement with shaft should be finished and alined within a limit the sh f he p t in turn b in fa ned to of .002 or .003 of an inch, due tothe high multithe adjacent face of the wheel. However, it is plication of the error in the distance from the preferred o p de a DOSi e'd V e a eprojector to the screen. It is exceedingly dlfiim n etween th e p The y nn c n cult, if not impossible to observe this limit, beis p ferab y loose o h i y be coupled cause the shaft is liable to bedistorted beyond Without using force on the Sh d beco es this limit by the stresses set up in the operation a d during the running of the machine. of mounting the sprocketon theshaft. In one Thus, the wheel is removed by mere y rem type of mounting, for example, the sprocket is the Screws, and is remounted y replacing the damped against a ld t on th shaft; screws in the holes provided therefor. By these Such a shoulder must be finished with still higher Operations he p ator of the machine can accuracy than that mentioned above, since any quickly reverse a sprocket when the teeth become error therein is multiplied through the length Worn on the driving side. of the sprocket and causes a substantialtilting The invention iS u y disclosed by y Of of the other end of the sprocket and a correspondample in the following description d n the ing distortion of the shaft. Even if the shoulder mpany n r w in whi h: is perfect, a particle of dust lodging between the Figure l is an end view of a sprocket whe shoulder and the adjacent end of the sprocket is ssemb y c di to e invention; sufficient to distort the shaft beyond the permis- Figure 2 is a section on the line 22v of Figsible limit. In the assembling operation it is ure 1; practically impossible to keep the shoulder and Figure 3 is a similar section in a pe pendicuthe adjacent end of the'sprocket free of dirt.. in) lar plane;

Similar considerations apply to the mounting F gure 4 is an elevation of the inner side of the of the flywheel on the cam shaft of an intermitretaining plate; tent movement, inasmuch as this shaft must be Figure 5 is an end view of the sprocket shaft; given and must maintain a very delicate adjust Figure 6 is an elevation of the same end; and ment with relation to the sprocket or star wheel Figure 7 is a diametrical section of a flywheel shaft assembly according to the invention.

Accordingly, one of the objects of this inven- Reference to these views will now be made by tion is to provide a wheel mounting that does use of like characters which are employed to not require clamping the wheel against a shoulder designate corresponding parts throughout. on the shaft and does not otherwise distort the M The sprocket shaft I is an accurately finished shaft. In other words, the entire structure for member and accurately mounted in t bearings securing the wheel to the shaft is located at one The Sprocket is f the usual construction face of the wheel and Oneend of t Shaft prising a hub 2 with end heads 3 carrying spaced in such a manner as to pro no bindlng sprocket teeth 4. The sprocket is fitted close force d y lengthwise 0f the Shaft The on its shaft because side play in the feeding of rem i face of the Wheel requires no fastening the film is to be avoided. For the same reason, or binding connection to the shaft. any springing or distortion of the shaft in the Another object of the invention is to facilimounting of the Sprocket thereon, beyond a very tate replacement or reversal of the sp In small allowance, is also to be avoided, to which present practice, it is customary to replace the purpcge this invention is directed entire intermittent assembly W t e Sp o It will be seen that the shaft has no abutment shaft requires attention. According to the inengaging the inner end of the sprocket. Nostop vention, the sprocket may readily be re ov shoulder, which at best must be very accurately and a new one applied without removing the shaft machined, is necessary. A plate 5 is laid across from the machine. Further, this operation as 56 the free end of the shaft and sprocket and secured to the latter by a pair of screws 6. The plate is previously drilled and the sprocket tapped for this purpose, the holes 1 in the plate being preferably countersunk to receive the heads of treme tightening of the screw is.liable to dis-.- tort the shaft, and a positive drive between the shaft and the plate is provided, so that the screwneed only retain the plate and attached sprocket from shifting lengthwis of the shaft. The driving connection is in the form of a key connection between the shaft, and the plate, in this case consisting of key l2 formed on the plate and extending into a slot I3 cut across the free end of thfi'shaft, although this construction may be reversed by forming the key in the shaft and the slot in the plate. The key fits loosely in the slot to avoid distorting the shaft during insertion. Also, if the plate should be tilted due to imperfect surfaces or aparticle of foreign matter at the inner surface of the plate, the looseness of'the'key in the slot will take up the deflection without transmitting it 'to the shaft. As the machine runs, the key will eventually abut the walls of the slo't'to form a positive drive.

For economy in construction, dowels l4 may be alternated with the screws 1, there being preferably'two'scr'ews and two dowels.

It .will now be evident that the sprocket is securedtozthe shaft merely by mounting the plate Sand. inserting the screws 5 and 8 and dowels I4; Since this assembly is disposed entirely at the free or exposed end of the shaft and sprocket, the sprocket may be removed without disturbing the shaft. Thus, if a spare sprocket is kept in stock, replacement can be made without interruption.

Frequently the sprocket teeth become Worn or notched on the driving side, and it becomes desirable to reverse the sprocket on the shaft. To enable such reversal, both ends of the sprocket are tapped at B to receive the screws 5 and drilled at I5 for the dowels.

In Figure 7 is shown the shaft 20 for the cam comprised in the intermittent mechanism and carrying a flywheel 2| for a purpose already recognized in the art. A screw 22 extends from the at'the square shoulder 23, the screw 22 being merely the equivalent of the screw 8 in the preceding figures, as will presently appear.

A plate is mounted in abutting relation against a face of the flywheel and is secured thereto by screws 25 corresponding to the screws 5.? Although the plate 24 surrounds the screw 22,"it is of such internal diameter as to abut the end '23 of 'the shaft 20 in the same manner as the plate 5 in Figures 1 to 4.

The plate is preferably fastened on the flywheel before the latter is mounted on the shaft. The driving connection is obtained in this case by means'of a Woodruff key 25 betweenthe shaft'andlthe hubZ'I and'the flywheel.

The key l2 in Figures 3 and-4, although differing'in specific construction from the key 25, neverthelessconstitutes a driving means between the shaft and thewheel or may be said to have a;driving relation to the Wheel.

It will be seen that illSbOth' embodiments, the

attachment is made entirely at one end 01 the shaft and one face of the wheel, requiring no further securing devices elsewhere on the shaft and at the other face of the wheel, with the result that no distorting force is applied to the shaft, in keeping with the objects described above.

Although specific embodiments'of the invention have been illustrated and described, it will be understood that various alterations in the details of construction may be made without departingfrom the scope of the invention as indicated by the appended claims.

ha clam:

1. A shaft and wheel assembly comprising a shaft of uniform diameter, a wheel of uniform bore'mounted thereon, means for holding said wheel against rotary and longitudinal movement relatively to saldshaft, said means comprising a plateabutting said wheel and an end of said shaft, means for securing said plate to said wheel, means securing said plate to said :shaft, and a keynextending into-said shaft andhaving ardrive in'g i'relati'on to? said .wheel,' said 'two' securing means and? plate J alone being; sufficient tor hold said'wheel against displacement. I

2. A shaft'andrwheel assembly comprising a shaft of uniform diameter, a wheel or uniform boremounted'thereon; means for "holding said wheel against rotary .andlongitudinal movement relatiyelyito rsaid shaft, said means comprising-a plate 'rabutting said'wheel" and an endtofr'said shaft;means for securing. said plate to said wheel, means tclampingrsaidplate. against-said end of said shaft with 'aIforce :axial of said" shaft; and a keyextending into said-shaft and having a drive ing relation to 'said'wheeh'said securing means andxclampedfplatepalone beingfsufilcient to hold said wheel against displacement:v

3.; A shaft iand f wheel assembly comprising. a shaft 1 of "uniform 'diameten'i a wheel a of uniform bore mountedi th'erecn; means for holding-said wheel" against rotary and longitudinal movement relatively to said shaft, saidmeans comprisinga plate abuttingsaid wheel an end of said shaft, -'screw 'means for" securing said plate to said wheey means clamping said plateagainst said; end'jof said shaft with a force axial of said shaft, and" a key extending into saidshaft, and havinga' driving relation to said wheel, said saw as. m ans an fl mned p e 'a c e be su fli nprit. tqholdsaid wheel against displacement;

A haft amiw as mb com a shaftof .unifojrm diametena wheel of uniform bore mounted" thereon, means for holding said wheelagainst rotary and longitudinal movement relativ ly. to said shaft, said means comprising a plate abutting said wheel and an end of said sha t. mea s for ecu g ai -p sai el. means securingsaid plate to said shaft, and drivirig. means between said shaft andplate, said two securing-means and plate alone being sufficient tohold said I wheel against displacement along its axis;

A haft and el a emb c m n a shaft of uniform diameter,-- a wheel of uniform bore-mounted. thereon, means for holding .said wheel against rotary and; longitudinalmovement relatively to said shaft,v said means comprising a plate::ahuttingsaid-wheel: and an. end ofsaid shaft; means-few securing" said plate to said wheeLgmeansa-securing1saidplate to said; shaft, and a' key:tconnectionpbetween said shaft and plate, saidrtwotsecunngnneans and plate alone being sufficient to hold said wheel against displacement along its axis.

6. A shaft and wheel assembly comprising a shaft of uniform diameter, a wheel of uniform bore mounted thereon, means for holding said wheel against rotary and longitudinal movement relatively to said shaft, said means comprising a plate abutting said wheel and an end of said shaft, means for securing said plate to said wheel, means securing said plate to said shaft, and driving means between said shaft and wheel, said two securing means and plate alone being sufficient to hold said wheel against displacement along its axis.

7. A shaft and Wheel assembly comprising a shaft of uniform diameter, a wheel of uniform bore mounted thereon, means for holding said wheel against rotary and longitudinal movement relatively to said shaft, said means comprising a plate abutting said wheel and an end of said shaft, means for securing said plate to said wheel, means securing said plate to said shaft, and a key connection between said shaft and wheel, said two securing means and plate alone being suflicient to hold said wheel against displacement along its axis.

8. A wheel assembly adapted to be mounted on a shaft without binding laterally thereon, said assembly comprising a Wheel of uniform bore, a plate adapted to engage the outer face of said wheel, means for securing said plate to said face, axially adjustable binding means adapted to engage the outer surface of said plate and to enter such shaft axially, whereby said securing means and said binding means are alone sufficient to prevent displacement of said wheel along its axis in either direction when mounted on a shaft, and a key incorporated in the assembly and adapted to extend into the bore of said wheel to lock with the shaft on which the Wheel is to be mounted.

9. A wheel assembly adapted to be mounted on a shaft without binding laterally thereon, said assembly comprising a wheel of uniform bore, a plate adapted to engage the outer face of said wheel, means for securing said plate to said face,

axially adjustable binding means adapted to engage the outer surface of said plate and to enter such shaft axially, whereby said securing means and said binding means are alone sufficient to prevent displacement of said wheel along its axis in either direction when mounted on a shaft, and a key projecting laterally from the inner face of said plate into said bore and adapted to lock endwise with the shaft on which the wheel is to be mounted.

10. A wheel assembly adapted to be mounted on a shaft without binding laterally thereon, said assembly comprising a wheel of uniform bore, a plate adapted to engage the outer face of said wheel, screw means adapted to enter said wheel parallelto its axis for securing said plate to said face, axially adjustable binding means adapted to engage the outer surface of said plate and to enter such shaft axially, whereby said securing means and said binding means are alone suflicient to prevent displacement of said wheel along its axis in either direction when mounted on a shaft, and a key incorporated in the assembly and adapted to extend into the bore of said wheel to lock with the shaft on which the wheel is to be mounted.

11. A sprocket wheel assembly for motion picture machines, adapted to be mounted on a shaft without binding laterally thereon, said assembly comprising a. sprocket wheel elongated axially relatively to its diameter and having a uniform bore, a plate adapted to engage the outer face of said wheel, means for securing said plate to said face, axially adjustable binding means adapted to engage the outer surface of said plate and to enter such shaft axially, whereby said securing means and said binding means are alone sufficient to prevent displacement of said Wheel along its axis in either direction when mounted on a shaft, and a key incorporated in the assembly and adapted to extend into the bore of said wheel to lock with the shaft on which the wheel is to be mounted.

KARL BRENKERT. 

